Abstract
Since the discovery of optical phase conjugation in 1972 researchers tried to generate phase conjugated beams with different nonlinear media and various techniques for many applications1-3. Self-pumped phase conjugation (SPPC) is obtained by stimulated Brillouin scattering or wave mixing in photorefractive crystals. The SBS-effect is observed with pulsed lasers at a high threshold power in the range of about 10 kW whereas photoreffactives operate with continuous powers in the mW-range. These crystals are expensive and available only for small optical apertures of about 1 cm2. In contrast liquid crystal cells may have much larger dimensions and offer also high optical nonlinearities. It was shown4 that self-pumped phase conjugation in liquid crystals can be realized by wave mixing effects with threshold powers less than 1 W.
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